To be straightforward—It sounds like it’s time for RCIA to me. You seem pretty confident in your search and your own ability to discern the truth. Many people have a few nagging questions about this or that. Completely normal. I think you’ll find that what you likely feel about all the Mary stuff is true—That the official Church teaching and positions on Mary are sensible and logical, but a small minority of the lay faithful take it too far. There are one billion of us, after all. Many converts who have worried about the Mary stuff end up loving the honorable way the Church treats the mother of Christ. It really is beautiful once you understand the official teaching of the Church. (I, too, strongly recommend the Hahn book—or ANY Scott Hahn book for that matter

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I think you are blessed because most RCIA programs begin in the fall (though some are year-round) which means one may be starting soon in you area. Perhaps the Holy Spirit is trying to tell you something by putting this nagging question in your head at this time. Just remember–RCIA is NOT a commitment, it’s an exploration. You can always defer your decision until later even if you are in the class.
Another thing, though—To be frank, sometimes the RCIA classes run by some parishes are not that well done. If you end up going and it’s not to your liking, don’t hesitate to look for a better one.
I’ve also known people who studied more on their own but stuck with their disappointing class—to go through the official Rites.
Don’t get me wrong–there are many great RCIA programs—I just don’t want you to be disappointed if yours is just “okay”.
It may not be the right time for you, but I know people who were in your position who ended up saying “What the heck was I waiting for?!?” after finally joining the Church.
Above all, don’t be pressured either way by friends, family, or Catholics on message boards. This is between you and God.